S000022521 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 112 Months Ended | 120 Months Ended | 199 Months Ended | 355 Months Ended | ||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| Russell 2500™ Growth Index (reflects no deduction for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 10.31% | 2.98% | 10.55% | 8.31% | ||||
| Russell 3000 Index (reflects no deduction for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 17.15% | 13.15% | 14.29% | 10.03% | ||||
| Retail Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 21.94% | 11.39% | 20.66% | 14.00% | ||||
| Performance Inception Date | May 31, 1996 | |||||||
| Retail Shares | After Taxes on Distributions | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 21.94% | 10.09% | 19.55% | 13.52% | ||||
| Performance Inception Date | May 31, 1996 | |||||||
| Retail Shares | After Taxes on Distributions and Sales | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 12.99% | 8.68% | 17.45% | 12.70% | ||||
| Performance Inception Date | May 31, 1996 | |||||||
| Institutional Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1] | 22.26% | 11.68% | 20.97% | 14.16% | |||
| Performance Inception Date | [1] | May 29, 2009 | ||||||
| R6 Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1] | 22.26% | 11.68% | 14.17% | 20.97% | |||
| Performance Inception Date | [1] | Aug. 31, 2016 | ||||||
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